Moritz ullmann



(No Model.)

M. ULLMANN.

GALIPBB. JOINT.

No. 485,339. Patented Nov. l, 1892.

e mi...

UNITED STATESv PATENT GFFICE.

MORITZ ULLMANN, OF STUTTGART, GERMANY.

CALlPER-JOINT.

SPECIFICATION forming part of Letters Patent No. 485,339, dated November1, 1892.

Application filed July l, 1892. Serial No.438,`701 (No model.)

To @ZZ whom t may concern,.-

Be it known that I, MORITZ ULLMANN, a

citizen of the Kingdom of Wrtemberg, residing at Stuttgart, in theEmpire of Germany, have invented a certain new and useful Improvement inCompasses; and I do hereby declare the following to be a full, clear,and exact description of theinvention, such as will enable othersskilled in the art to which it appertains to make and use the same. rlheobject of the present invention is to automatically spread the two legsof compasses or dividers by a spiral spring located in the head of thesame, so that in setting them to any desired measurement the two legsmust be pressed together. When the legs have attained the desiredrelative position, they are automatically retained in their position ofadjustment by a spring-dog secured to one leg and pressed against thethimble or casing of the other leg until by pressing upon the dog thesame is released from the thimble, so as to permit the two legs to beagain automatically spread apart by the action of the spiral spring.

In the accompanying drawings, Figure l represents a longitudinal sectionof a pair of Compasses or dividers embodying my invention, the lowerportions being broken away; Figs. 2 `and 4, a front and side elevation,respectively, of one of the divider-legs removed; Figs. 3 and 5, similarviews, respectively, of the other divider-leg.

The leg A is provided with a hollow head or thimble d, into which iitsthe hollow thimble or pivot h of the leg B, being connected with thesame by a screw c, fastened in the thimble d. Within the thimble b isarranged a spiral spring s, one end of which is secured to thescrew-stud c, while the other end is secured to the thimble b, so thatby the resiliency of the spring s thus arranged in the hinge of thedividers the legs A and B are spread apart. The spring-dog f, fastenedto the leg B, bears against the periphery of the hollow head I a. of theleg A with its toe f', as shown. The dog f must be arranged withrelation to the thimble a in such manner that its pressure will besufficient to overcome the power of the spiral spring s. By thisarrangement the tendency of the legs A and B to spread apart serves tohold the dog f against the periphery of thimble a, the dog f beingtightly jammed or wedged against the same and securely holds the legs inthe relative position which they may occupy. The toe f is readilyreleased by a slight pressure upon the tongue f2, projecting from theleg B, and the dividers may then be again set as desired. Similarautomatic clamping devices may also be applied to the joints oflead-carriers, bowpin attachments, and extensions for dividers orCompasses.

I claiml. In dividers, the combination, with a divider-leg provided witha hollow head or thimble integral therewith and a central stud, of asecond divider-leg provided with a hollow head or thimble integraltherewith and fitting into the thimble of the first divider-leg, aspring connected to the stud and to the thimble of the seconddivider-leg, and means for holding the divider-legs in any position ofadjustment, substantially as set forth.

2. In dividers, the combination of two di- Vider-legs having thimblesiitting one within the other,with a spiral spring connected with itsrespective ends to the two dividerdegs, and a spring-dog attached to theone dividerleg and bearing against the thimble of the other divider-leg,substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

MORITZ ULLMANN. Witnesses:

AUGUST B. DRAUTZ, CARL HARTIG.

